Lueders Formation
(Permian; Leonard Series) at surface, covers 14 % of this area Lueders Formation
Elm Creek Formation
(Permian; Leonard Series) at surface, covers 8 % of this area Elm Creek Formation
Grape Creek Formation
(Permian; Leonard Series) at surface, covers 6 % of this area Grape Creek Formation
Admiral Formation
(Permian; Wolfcamp Series) at surface, covers 5 % of this area Admiral Formation
Alluvium
(Holocene) at surface, covers 5 % of this area Alluvium
Talpa Formation
(Permian; Leonard Series) at surface, covers 3 % of this area Talpa Formation
Terrace deposits
(Pleistocene and Holocene) at surface, covers 2 % of this area Terrace deposits
Clear Fork Group
(Permian; Leonard Series) at surface, covers 2 % of this area Clear Fork Group
Archer City Formation
(Permian; Wolfcamp Series) at surface, covers 1 % of this area Archer City Formation
Pueblo Formation
(Permian; Wolfcamp Series) at surface, covers 1 % of this area Pueblo Formation
Markley Formation
(Pennsylvanian to Early Permian) at surface, covers 0.6 % of this area Markley Formation
Harpersville Formation
(Pennsylvanian; Virgil Series) at surface, covers 0.2 % of this area Harpersville Formation
Seymour Formation
(Middle Pleistocene; Irvingtonian) at surface, covers 0.1 % of this area Seymour Formation